Messages in this thread | | | From | Julien Thierry <> | Subject | [PATCH v3 0/8] arm64: IRQ priority masking and Pseudo-NMI fixes | Date | Thu, 6 Jun 2019 10:31:49 +0100 |
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Version one[1] of this series attempted to fix the issue reported by Zenghui[2] when using the function_graph tracer with IRQ priority masking.
Since then, I realized that priority masking and the use of Pseudo-NMIs was more broken than I thought.
* Patch 1-2 are just some cleanup * Patch 3 fixes a potential issue with not clobbering condition flags in irqflags operations * Patch 4 fixes an issue where calling C code in Pseudo-NMI before entering NMI enter could lead to potential races * Patch 5 fixes the function_graph issue when using priority masking * Patch 6 introduces some debug to hopefully avoid breaking things in the future * Patch 7 is a rebased version of the patch sent by Wei Li[3] fixing an error that can happen during on some platform using the priority masking feature * Patch 8 re-enables the Pseudo-NMI selection
Changes since V2 [4]: - Rebase on v5.2-rc3 - clobber conditions flags for asm that needs it as pointed out by Marc Z. and Robin M. - Fix the naming of the new PMR bit value - Introduce some helper for the debug conditions - use WARN_ONCE for debug that might be very noisy - Reenable pseudo NMI.
Changes since V1 [1]: - Fix possible race condition between NMI and trace irqflags - Simplify the representation of PSR.I in the PMR value - Include Wei Li's fix - Rebase on v5.1-rc7
[1] https://marc.info/?l=linux-arm-kernel&m=155542458004480&w=2 [2] https://www.spinics.net/lists/arm-kernel/msg716956.html [3] https://www.spinics.net/lists/arm-kernel/msg722171.html [4] https://lkml.org/lkml/2019/4/29/643
Cheers,
Julien
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Julien Thierry (7): arm64: Do not enable IRQs for ct_user_exit arm64: irqflags: Pass flags as readonly operand to restore instruction arm64: irqflags: Add condition flags to inline asm clobber list arm64: Fix interrupt tracing in the presence of NMIs arm64: Fix incorrect irqflag restore for priority masking arm64: irqflags: Introduce explicit debugging for IRQ priorities arm64: Allow selecting Pseudo-NMI again
Wei Li (1): arm64: fix kernel stack overflow in kdump capture kernel
arch/arm64/Kconfig | 12 +++++- arch/arm64/include/asm/arch_gicv3.h | 4 +- arch/arm64/include/asm/cpufeature.h | 6 +++ arch/arm64/include/asm/daifflags.h | 75 +++++++++++++++++++++------------ arch/arm64/include/asm/irqflags.h | 79 +++++++++++++++++----------------- arch/arm64/include/asm/kvm_host.h | 7 ++-- arch/arm64/include/asm/ptrace.h | 10 ++++- arch/arm64/kernel/entry.S | 84 +++++++++++++++++++++++++++++-------- arch/arm64/kernel/irq.c | 26 ++++++++++++ arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/smp.c | 6 +-- arch/arm64/kvm/hyp/switch.c | 2 +- drivers/irqchip/irq-gic-v3.c | 6 +++ kernel/irq/irqdesc.c | 8 +++- 14 files changed, 227 insertions(+), 100 deletions(-)
-- 1.9.1
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